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Babesiosis medical comic

This comic presents babesiosis as 'the shepherd's malaria', a malaria-like illness carried by hard ticks. It explains how Babesia skips the liver and goes straight for red cells, how to tell it apart from Plasmodium falciparum on a blood film, and the two-drug treatment.

For MBBS, NEET-PG, FMGE, NEXT and USMLE revision.

Babesiosis: what the comic covers

High-yield points

  • Babesiosis is a tick-borne, malaria-like haemolytic infection of cattle and other animals that can spread to humans; Babesia microti is the commonest human species.
  • The vector is the hard tick Ixodes scapularis, not a mosquito; most human cases come from temperate regions such as the USA and Europe.
  • Unlike malaria, Babesia has no liver stage — the parasites enter red blood cells directly.
  • Disease is usually milder than falciparum malaria, with non-periodic fever and lower parasitaemia; it is more severe without a spleen.
  • The blood film shows ring forms inside red cells, sometimes arranged as tetrads — the 'Maltese cross'.
  • Unlike P. falciparum, Babesia has no haemozoin pigment and no crescent-shaped gametocytes.
  • Standard treatment is atovaquone plus azithromycin.

Mnemonics from the comic

  • Blood film: Four babes forming a cross — tetrad equals Maltese cross.
  • Treatment: The one-two punch: A and A — atovaquone and azithromycin.

Quick questions

How do you tell Babesia from Plasmodium falciparum on a blood smear?

Both show small ring forms inside red cells, but Babesia may form tetrads (the Maltese cross) and has no haemozoin pigment or crescent-shaped gametocytes.

How is babesiosis transmitted?

Mainly by the bite of hard ticks of the genus Ixodes. It can also spread through blood transfusion.

What is the treatment for babesiosis?

Atovaquone with azithromycin for most patients.

Is this comic free to read?

The first pages are free to preview. Members read the full comic, and you can sign up free to read one comic in full.

Read next

Topic map: Babesiosis in 7 branches

  1. Parasite and tick
    • Babesia microti
    • Hard tick, not a mosquito
    • Animal reservoirs
    • Temperate regions
    • Blood transfusion
  2. Life cycle
  3. Clinical picture
  4. Blood film
  5. Other tests
  6. Treatment
  7. Prevention

26 points, each linked to its comic page. Guests open the first branch; a free account opens two; Hero and Superhero members open the whole map.

Practice MCQs (20 questions, NEET-PG and USMLE style)

Question 1 (NEET-PG style)

What is the primary vector and definitive host for Babesia microti?

  1. Anopheles stephensi
  2. Ixodes scapularis
  3. Culex quinquefasciatus
  4. Phlebotomus argentipes

Answer: B. Ixodes scapularis

Ixodes scapularis (hard deer tick) acts as the primary vector and definitive host for Babesia microti.

Question 2 (NEET-PG style)

Unlike Plasmodium falciparum, Babesia species lack which of the following stages in their human life cycle?

  1. Intraerythrocytic trophozoite stage
  2. Pre-erythrocytic hepatic schizogony
  3. Binary fission within erythrocytes
  4. Erythrocyte penetration by sporozoites

Answer: B. Pre-erythrocytic hepatic schizogony

Babesia sporozoites directly invade red blood cells without undergoing an exoerythrocytic (hepatic/liver) stage. In contrast, Plasmodium species must complete a pre-erythrocytic hepatic cycle before entering red blood cells.

Practice questions written by Q World Medical Comics. Not affiliated with NBEMS, NBME or the USMLE program.

High-yield flash cards (29 cards)

Causative organisms of human babesiosis
*Babesia microti* (north-eastern and upper midwestern USA, the commonest), *B. divergens* (Europe, mainly in asplenic patients), *B. duncani* (US west coast) and *B. venatorum*
Vector of babesiosis
The hard tick *Ixodes scapularis* (deer or black-legged tick) in the USA and *I. ricinus* in Europe — the same ticks that carry Lyme disease and anaplasmosis; the nymph transmits most cases in late spring and summer — Mnemonic: a hard tick, not a mosquito, carries the shepherd's malaria.
Reservoir host of *Babesia microti*
The white-footed mouse (*Peromyscus leucopus*); deer feed adult ticks but are not infected

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